forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
282 lines
7.4 KiB
282 lines
7.4 KiB
/* |
|
* Copyright (c) 2004 Topspin Communications. All rights reserved. |
|
* |
|
* This software is available to you under a choice of one of two |
|
* licenses. You may choose to be licensed under the terms of the GNU |
|
* General Public License (GPL) Version 2, available from the file |
|
* COPYING in the main directory of this source tree, or the |
|
* OpenIB.org BSD license below: |
|
* |
|
* Redistribution and use in source and binary forms, with or |
|
* without modification, are permitted provided that the following |
|
* conditions are met: |
|
* |
|
* - Redistributions of source code must retain the above |
|
* copyright notice, this list of conditions and the following |
|
* disclaimer. |
|
* |
|
* - Redistributions in binary form must reproduce the above |
|
* copyright notice, this list of conditions and the following |
|
* disclaimer in the documentation and/or other materials |
|
* provided with the distribution. |
|
* |
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
|
* SOFTWARE. |
|
*/ |
|
|
|
#include <linux/errno.h> |
|
#include <linux/pci.h> |
|
#include <linux/delay.h> |
|
#include <linux/slab.h> |
|
|
|
#include "mthca_dev.h" |
|
#include "mthca_cmd.h" |
|
|
|
int mthca_reset(struct mthca_dev *mdev) |
|
{ |
|
int i; |
|
int err = 0; |
|
u32 *hca_header = NULL; |
|
u32 *bridge_header = NULL; |
|
struct pci_dev *bridge = NULL; |
|
int bridge_pcix_cap = 0; |
|
int hca_pcie_cap = 0; |
|
int hca_pcix_cap = 0; |
|
|
|
u16 devctl; |
|
u16 linkctl; |
|
|
|
#define MTHCA_RESET_OFFSET 0xf0010 |
|
#define MTHCA_RESET_VALUE swab32(1) |
|
|
|
/* |
|
* Reset the chip. This is somewhat ugly because we have to |
|
* save off the PCI header before reset and then restore it |
|
* after the chip reboots. We skip config space offsets 22 |
|
* and 23 since those have a special meaning. |
|
* |
|
* To make matters worse, for Tavor (PCI-X HCA) we have to |
|
* find the associated bridge device and save off its PCI |
|
* header as well. |
|
*/ |
|
|
|
if (!(mdev->mthca_flags & MTHCA_FLAG_PCIE)) { |
|
/* Look for the bridge -- its device ID will be 2 more |
|
than HCA's device ID. */ |
|
while ((bridge = pci_get_device(mdev->pdev->vendor, |
|
mdev->pdev->device + 2, |
|
bridge)) != NULL) { |
|
if (bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE && |
|
bridge->subordinate == mdev->pdev->bus) { |
|
mthca_dbg(mdev, "Found bridge: %s\n", |
|
pci_name(bridge)); |
|
break; |
|
} |
|
} |
|
|
|
if (!bridge) { |
|
/* |
|
* Didn't find a bridge for a Tavor device -- |
|
* assume we're in no-bridge mode and hope for |
|
* the best. |
|
*/ |
|
mthca_warn(mdev, "No bridge found for %s\n", |
|
pci_name(mdev->pdev)); |
|
} |
|
|
|
} |
|
|
|
/* For Arbel do we need to save off the full 4K PCI Express header?? */ |
|
hca_header = kmalloc(256, GFP_KERNEL); |
|
if (!hca_header) { |
|
err = -ENOMEM; |
|
goto put_dev; |
|
} |
|
|
|
for (i = 0; i < 64; ++i) { |
|
if (i == 22 || i == 23) |
|
continue; |
|
if (pci_read_config_dword(mdev->pdev, i * 4, hca_header + i)) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't save HCA " |
|
"PCI header, aborting.\n"); |
|
goto free_hca; |
|
} |
|
} |
|
|
|
hca_pcix_cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_PCIX); |
|
hca_pcie_cap = pci_pcie_cap(mdev->pdev); |
|
|
|
if (bridge) { |
|
bridge_header = kmalloc(256, GFP_KERNEL); |
|
if (!bridge_header) { |
|
err = -ENOMEM; |
|
goto free_hca; |
|
} |
|
|
|
for (i = 0; i < 64; ++i) { |
|
if (i == 22 || i == 23) |
|
continue; |
|
if (pci_read_config_dword(bridge, i * 4, bridge_header + i)) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't save HCA bridge " |
|
"PCI header, aborting.\n"); |
|
goto free_bh; |
|
} |
|
} |
|
bridge_pcix_cap = pci_find_capability(bridge, PCI_CAP_ID_PCIX); |
|
if (!bridge_pcix_cap) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't locate HCA bridge " |
|
"PCI-X capability, aborting.\n"); |
|
goto free_bh; |
|
} |
|
} |
|
|
|
/* actually hit reset */ |
|
{ |
|
void __iomem *reset = ioremap(pci_resource_start(mdev->pdev, 0) + |
|
MTHCA_RESET_OFFSET, 4); |
|
|
|
if (!reset) { |
|
err = -ENOMEM; |
|
mthca_err(mdev, "Couldn't map HCA reset register, " |
|
"aborting.\n"); |
|
goto free_bh; |
|
} |
|
|
|
writel(MTHCA_RESET_VALUE, reset); |
|
iounmap(reset); |
|
} |
|
|
|
/* Docs say to wait one second before accessing device */ |
|
msleep(1000); |
|
|
|
/* Now wait for PCI device to start responding again */ |
|
{ |
|
u32 v; |
|
int c = 0; |
|
|
|
for (c = 0; c < 100; ++c) { |
|
if (pci_read_config_dword(bridge ? bridge : mdev->pdev, 0, &v)) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't access HCA after reset, " |
|
"aborting.\n"); |
|
goto free_bh; |
|
} |
|
|
|
if (v != 0xffffffff) |
|
goto good; |
|
|
|
msleep(100); |
|
} |
|
|
|
err = -ENODEV; |
|
mthca_err(mdev, "PCI device did not come back after reset, " |
|
"aborting.\n"); |
|
goto free_bh; |
|
} |
|
|
|
good: |
|
/* Now restore the PCI headers */ |
|
if (bridge) { |
|
if (pci_write_config_dword(bridge, bridge_pcix_cap + 0x8, |
|
bridge_header[(bridge_pcix_cap + 0x8) / 4])) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't restore HCA bridge Upstream " |
|
"split transaction control, aborting.\n"); |
|
goto free_bh; |
|
} |
|
if (pci_write_config_dword(bridge, bridge_pcix_cap + 0xc, |
|
bridge_header[(bridge_pcix_cap + 0xc) / 4])) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't restore HCA bridge Downstream " |
|
"split transaction control, aborting.\n"); |
|
goto free_bh; |
|
} |
|
/* |
|
* Bridge control register is at 0x3e, so we'll |
|
* naturally restore it last in this loop. |
|
*/ |
|
for (i = 0; i < 16; ++i) { |
|
if (i * 4 == PCI_COMMAND) |
|
continue; |
|
|
|
if (pci_write_config_dword(bridge, i * 4, bridge_header[i])) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't restore HCA bridge reg %x, " |
|
"aborting.\n", i); |
|
goto free_bh; |
|
} |
|
} |
|
|
|
if (pci_write_config_dword(bridge, PCI_COMMAND, |
|
bridge_header[PCI_COMMAND / 4])) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't restore HCA bridge COMMAND, " |
|
"aborting.\n"); |
|
goto free_bh; |
|
} |
|
} |
|
|
|
if (hca_pcix_cap) { |
|
if (pci_write_config_dword(mdev->pdev, hca_pcix_cap, |
|
hca_header[hca_pcix_cap / 4])) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't restore HCA PCI-X " |
|
"command register, aborting.\n"); |
|
goto free_bh; |
|
} |
|
} |
|
|
|
if (hca_pcie_cap) { |
|
devctl = hca_header[(hca_pcie_cap + PCI_EXP_DEVCTL) / 4]; |
|
if (pcie_capability_write_word(mdev->pdev, PCI_EXP_DEVCTL, |
|
devctl)) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't restore HCA PCI Express " |
|
"Device Control register, aborting.\n"); |
|
goto free_bh; |
|
} |
|
linkctl = hca_header[(hca_pcie_cap + PCI_EXP_LNKCTL) / 4]; |
|
if (pcie_capability_write_word(mdev->pdev, PCI_EXP_LNKCTL, |
|
linkctl)) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't restore HCA PCI Express " |
|
"Link control register, aborting.\n"); |
|
goto free_bh; |
|
} |
|
} |
|
|
|
for (i = 0; i < 16; ++i) { |
|
if (i * 4 == PCI_COMMAND) |
|
continue; |
|
|
|
if (pci_write_config_dword(mdev->pdev, i * 4, hca_header[i])) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't restore HCA reg %x, " |
|
"aborting.\n", i); |
|
goto free_bh; |
|
} |
|
} |
|
|
|
if (pci_write_config_dword(mdev->pdev, PCI_COMMAND, |
|
hca_header[PCI_COMMAND / 4])) { |
|
err = -ENODEV; |
|
mthca_err(mdev, "Couldn't restore HCA COMMAND, " |
|
"aborting.\n"); |
|
} |
|
free_bh: |
|
kfree(bridge_header); |
|
free_hca: |
|
kfree(hca_header); |
|
put_dev: |
|
pci_dev_put(bridge); |
|
return err; |
|
}
|
|
|